A microgrid system and a control method for the microgrid system

Abstract

The invention provides a micro-grid system and a control method thereof, and relates to the technical field of micro grids. The micro-grid system can smoothly switch to an off-grid state from a grid-connected state. The micro-grid system comprises a first block, a second block and a micro-grid central control module, a medium-voltage energy storage module of the second block provides power for all loads in the system before the system enters isolated island operation from the off-grid state, a micro power supply in a micro-grid energy using module of the first block supplies power for a load unit after the system enters isolated island operation from the off-grid state, the micro-grid central control module predicts maximum discharge power of the medium-voltage energy storage module, power supplied by a micro power supply unit and power needed by the load unit and issues instructions after the system is in the off-grid state, and a terminal data acquisition and control module of the first block invests or removes the loads under control of the instructions. The micro-grid system is used for independently supplying power for the loads in the off-grid state.

Description

technical field [0001] The invention relates to the technical field of distributed energy generation and micro-grid control, in particular to a micro-grid system and a control method for the micro-grid system. Background technique [0002] Microgrid system is an intelligent and controllable small grid system that combines distributed power generation system, energy storage and terminal load, and it is an autonomous system that can realize self-control, protection and management. The microgrid system mainly includes a micro power supply unit for supplying power and a load unit for consuming power. Wherein, the micro power supply unit includes at least one micro power supply, and the load unit includes at least one load. Compared with the external grid, the microgrid system has two operating modes: grid-connected and off-grid: when the external grid supplies power normally, the micro power supply in the microgrid system is incorporated as an auxiliary power supply, and transm...

AI Technical Summary

Problems solved by technology

[0003] However, the existing micro-grid system generally has the following problems: when a sudden failure occurs in the external power grid, the existing micro-grid system cannot immediately divide a suitable island according to the power that the micro-power supply unit can supply and the power required by the load unit range, and before the appropriate island range is divided, the micro power supply in the micro power supply unit is not enough to supply power to all the loads in the load unit, so that before the appropriate island range is divided, all the loads in the micro grid system In the state of power outage, that is to say, when the external power grid suddenly fails, the existing microgrid system cannot guarantee smooth and seamless switching from the grid-connected state to the off-grid state

In addition, the existing micro-grid system can only divide the island range once, and cannot guarantee the balance between the power supplied by the micro-power unit and the power required by the load unit, thus reducing the safety and reliability of the micro-grid system. and energy efficiency

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